cant build or install thre borg unilink

Exception in UIRootUpdate: System.NullReferenceException: Object reference not set to an instance of an object
at RimWorld.CompFacility.DrawLinesToPotentialThingsToLinkTo (Verse.ThingDef myDef, Verse.IntVec3 myPos, Verse.Rot4 myRot, Verse.Map map) [0x00094] in <9e3aa4883d2e4cf2ae27337847d757d1>:0
at RimWorld.PlaceWorker_ShowFacilitiesConnections.DrawGhost (Verse.ThingDef def, Verse.IntVec3 center, Verse.Rot4 rot, UnityEngine.Color ghostCol, Verse.Thing thing) [0x00022] in <9e3aa4883d2e4cf2ae27337847d757d1>:0
at Verse.GhostDrawer.DrawGhostThing (Verse.IntVec3 center, Verse.Rot4 rot, Verse.ThingDef thingDef, Verse.Graphic baseGraphic, UnityEngine.Color ghostCol, Verse.AltitudeLayer drawAltitude, Verse.Thing thing) [0x0007e] in <9e3aa4883d2e4cf2ae27337847d757d1>:0
at RimWorld.Designator_Install.DrawGhost (UnityEngine.Color ghostCol) [0x00062] in <9e3aa4883d2e4cf2ae27337847d757d1>:0
at RimWorld.Designator_Place.SelectedUpdate () [0x00065] in <9e3aa4883d2e4cf2ae27337847d757d1>:0
at RimWorld.Designator_Install.SelectedUpdate () [0x00000] in <9e3aa4883d2e4cf2ae27337847d757d1>:0
at Verse.DesignatorManager.DesignatorManagerUpdate () [0x00013] in <9e3aa4883d2e4cf2ae27337847d757d1>:0
at RimWorld.MapInterface.MapInterfaceUpdate () [0x00027] in <9e3aa4883d2e4cf2ae27337847d757d1>:0
at RimWorld.UIRoot_Play.UIRootUpdate () [0x00015] in <9e3aa4883d2e4cf2ae27337847d757d1>:0
Verse.Log:Error(String, Boolean)
RimWorld.UIRoot_Play:UIRootUpdate()
Verse.Root:DMD<DMD<Update_Patch1>?139437056::Update_Patch1>(Root)
Verse.Root_Play:Update()